@article{01658430,
title = {Oscillations and nonoscillations in retarded equations.},
journal = {Portugaliae Mathematica. Nova S\'erie},
volume = {58},
year = {2001},
pages = {127-138},
zbl = {0983.45001},
language = {en},
url = {http://dml.mathdoc.fr/item/01658430}
}
Ferreira, José M. Oscillations and nonoscillations in retarded equations.. Portugaliae Mathematica. Nova Série, Tome 58 (2001) pp. 127-138. http://gdmltest.u-ga.fr/item/01658430/